This photograph is my first attempt at combining a Nikon TC-300 2x teleconverter and my D500’s 1.5 APS-C crop to achieve a 1800mm focal distance with the Nikon AI-S Nikkor 600mm F/4 ED-IF manual focus telephoto prime lens.
The Tufted titmouse pair fills the frame with a minor aesthetic post crop to remove a zone focus artifact.